The invention discloses a laser head phase angle adaptive control method for laser-assisted cutting. The method mainly comprises the steps of first, measuring the speed Vx of a main shaft of a cuttingmachine in the X direction, and the speed of the main shaft of the cutting machine in the Y direction; second, entering the third step if Vx is larger than zero, entering the fourth step if Vx is smaller than zero, and entering the fifth step if Vx is equal to zero; third, calculating the included angle theta between the current position of a laser head and the X axis, and the rotating angle theta 1 of the laser head, wherein the theta 1 is equal to theta minus theta 0; fourth, using a stepping motor to control the laser head to turn in the forward direction for 180 degrees, and after turning, calculating the included angle theta between the current position of the laser head and the X axis, and the rotating angle theta 1 of the laser head, wherein the theta 1 is equal to theta minus theta 0; and fifth, when Vy is larger than zero, the rotating angle theta 1 of the laser head is equal to 90 degrees, and when Vy is smaller than zero, the rotating angle theta 1 of the laser head is equal to 90 degrees. The laser head phase angle adaptive control method for laser-assisted cutting can adapt to complex machining paths, and can implement intelligent laser heating assisted cutting when amotion paths changes.